ABSTRACT:


Because software is sizing more and more huge, and files more and more large, high debits are now necessary. MODEMS (MODulator - DEModulator) have to follow this technical way. As answers to the computer-market a lot of solutions are sold : from V32 (9600 bit/s) to V34 (until 28800 bits/s) with also V32 bis (14400 bit/s) and V32 terbo (19200 bit/s).
We underline that Modem constructors conform to VITT (old CCITT) recommandations. VITT just notify V34 specifications at september, 1994 for 28.8 Kbit/s modems. So there is no denying thatit is the end of 19.2 Kbit/s V32 terbo not officially recognized.
So we will study several modem's specifications by chronological apparition order after a summary about the different modem components.